on my eth0 i have 10.10.10.1 ip address , the speed is limited to 140mbits down 1000mbits up , if i move the ip address 10.10.10.1 to virtual interface same result (even on fiber or a different physical interface) but i use a different ip address i get 1000/1000 - any idea? (centos6)

is it caching? Arp?

im about to format but i dont want to
tried:
iptables disabled
purchased a fiber card
rebooted switch